Barack Obama has rendered one of his most important post-crisis verdicts: Ben Bernanke will be nominated for a second term as chairman of the Federal Reserve. This is a very shortsighted decision. While America’s head central banker deserves credit for being creative and courageous in orchestrating an unusually aggressive monetary easing programme, it is important to remember that his pre-crisis actions played an equally critical role in setting the stage for the most wrenching recession since the 1930s. It is as if a doctor guilty of malpractice is being given credit for inventing a miracle cure. Maybe the patient needs a new doctor.